A BCU control system (10) includes a BCU (14) that calculates various kinds of measured data based on battery states such as a temperature, voltage, current, etc., of an automobile battery (12) so as to control actuators such as fans (18A, 18B), a relay (12C), etc., and a computer (16) connected to the BCU by a communication line, thereby enabling to carry out a data communication. A data collection command and an actuator control command are transmitted from the computer (16) to the BCU (14), and the computer collects various kinds of data from the battery and the BCU so as to carry out processes such as a data display, a data analysis, etc., and control the BCU.